cups-base fails to compile

[E. J. Cerejo]

I'm running FreeBSD 6-stable and I just updated the ports tree using 
cvsup and the portupgrade tools, but now I get this error when I try to 
build cups-base:

cc  -Wshadow -Wunused -Wall -Wno-format-y2k -fPIC -Os -g -I.. 
-I/usr/local/include -O -pipe -march=pentium4 -D_LARGEFILE_SOURCE 
-D_LARGEFILE64_SOURCE -D_THREAD_SAFE -D_REENTRANT -I../.. 
`/usr/local/bin/php-config --includes` -I/usr/local/include 
-I/usr/local/include -I/usr/local/include -D_LARGEFILE_SOURCE 
-D_LARGEFILE64_SOURCE -D_THREAD_SAFE -D_REENTRANT -I../.. 
`/usr/local/bin/php-config --includes` -c phpcups.c
In file included from /usr/local/include/php/main/php.h:38,
                 from phpcups.c:33:
/usr/local/include/php/Zend/zend_API.h:327: warning: declaration of 
'index' shadows a global declaration
/usr/include/strings.h:50: warning: shadowed declaration is here
In file included from /usr/local/include/php/main/php.h:416,
                 from phpcups.c:33:
/usr/local/include/php/TSRM/tsrm_virtual_cwd.h:202: warning: declaration 
of 'link' shadows a global declaration
/usr/include/unistd.h:348: warning: shadowed declaration is here
In file included from /usr/local/include/php/main/php.h:418,
                 from phpcups.c:33:
/usr/local/include/php/Zend/zend_constants.h:63: warning: declaration of 
'strlen' shadows a global declaration
/usr/include/string.h:90: warning: shadowed declaration is here
phpcups.c: In function `zm_startup_phpcups':
phpcups.c:163: error: `CUPS_PRINTER_DISCOVERED' undeclared (first use in 
this function)
phpcups.c:163: error: (Each undeclared identifier is reported only once
phpcups.c:163: error: for each function it appears in.)
gmake[1]: *** [phpcups.o] Error 1
gmake[1]: Leaving directory 
`/usr/ports/print/cups-base/work/cups-1.3.3/scripting/php'
gmake: *** [all] Error 1
*** Error code 2

Stop in /usr/ports/print/cups-base.
*** Error code 1

Stop in /usr/ports/print/cups-base.

Does anyone know how to fix this?